An industrial plant claims to discharge no more than 1000 gallons of wastewater per hour, on the average, into a neighboring lake. An environmental action group decides to monitor the plant, in case this limit is being exceeded. A random sample of four hours is selected over a period of a week. The observations are 1614, 1077, 2014, 2231. a. Find the standard error. se = (Round to two decimal places as needed.)